> >Once we get down to a decision of supporting nested versus 
> >not supporting nesting, presumably we are then entirely in 
> >the realm of the multipart coding itself.
> > 
> >Could I ask someone to elaborate on what generic requirements 
> >already exist within multipart/mime in this respect, before 
> >we start looking at defining SIP specific rules or indications?
> 
> I am very sure that I have seen text related to the support of nested
> multiparts, and what nodes are expected to support, 
> somewhere, but I yet have not found it.

message/rfc822 [RFC2046], which is used when you forward a message,
routinely has nested multiparts when the message you're forwarding itself
had multiple parts.  It looks something like this:

  From: [EMAIL PROTECTED]
  To: [EMAIL PROTECTED]
  Content-Type: multipart/mixed; boundary=A
  
  --A
  Content-Type: text/plain
 
  here is that email I mentioned during lunch.

  --A
  Content-Type: message/rfc822

  From: Sammy Sammython <[EMAIL PROTECTED]>
  Content-Type: multipart/mixed; boundary=B
  Subject: Pictures from our recent trip
  
  --B
  Content-Type: text/plain
  
  Here are the pictures from the island!  Enjoy!

  --B
  Content-Type: image/jpg
  Content-Transfer-Encoding: base64

  EKFEJKFIEUJKEJKEJFF ...

  --B
  Content-Type: image/jpg
  Content-Transfer-Encoding: base64

  EKFEJKFIEUJKEJKEJFF ...

  --B--
  --A--

-d


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